Exhaust nozzle tip for locomotives



Sept. 9, 1952 c. w. BAKER EXHAUST NOZZLE TIP FOR LOCO'MOTIVES Filed Oct. 19, 1948 m w R.K w MA Q me O N r IS 0n Patented Sept. 9, 1952 i 2,609,986 1 EXHAUST NozzLE TIP Fon LoooMoTrvES Charles W. Baker, Spokane, Wash. d A Application october 19, 194s, serial No. 55,366 1 This yiI-iv'enti'on relates to locomotives and more particularlyjto an exhaust nozzle for use in the smoke box ofalocomotive to create a draft for the boiler of the locomotive.

' -A main object of the invention is to provide a novel and improved exhaust nozzle tip for locomotives which is very simple in construction, easy `to install, and which provides a smooth flow ofexhaust gases through the locomotive smoke stack, thereby :insuring an efficient draft for the locomotive boiler, without hazards of explosion or iire and without causing excessiveback pressure to be built up in the locomotive smoke box.

A further object of the invention is to provide an improved exhaust nozzletip for locomotives which-functions to entrainexhaust gases from the locomotive boiler withA exhaust steam from thelocornotive engine, providing a relatively low 'velocity flow ofgases through the locomotive sxnolgestack,` whereby the smoke stack is comy pletcly filled instead of being partially lled as with-- conventional structures, whereby a more effective vacuum is` 'created in the locomotive smoke box, andwhereby the exhaust and flow of gases upwardly through the stack will be smoothly controlled, avoiding the explosive action produced bythe conventional nozzle tip.

Further objects and advantages of the invention will become apparent from the following description and claims, and from theaccompanying drawings, wherein:

Figure 1 is a fragmentary side elevational View, partly in cross-section of the forward portion of a locomotive provided with an exhaust nozzle constructed in accordance with the present invention.

Figure 2 is a cross-sectional detail View taken on line 2-2 of Figure l.

Figure 3 is an enlarged top plan detail View of the exhaust nozzle employed in Figure 1.

Figure 4 is a cross-sectional view taken on line 4-4 of Figure 3.

Figure 5 is a cross-sectional view taken on line 5-5 of Figure 4.

Referring to the drawings, II designates a conventional locomotive having at its forward end the usual Smoke box I2 into which the boiler tubes I3 discharge, said smoke box being provided with the smoke stack I4 extending through its top wall for discharge. of the gaseous products of combustion and for creating the draft required by the boiler. Designated generally at I5 is the steam exhaust nozzle which conveys the exhaust Steam from the engine cylinders I6 of the locomotive into Y the `smoke box,n said :nozzle being positioned belowt the` smokest'aclz` I4 `:and in axial alignment therewith. In `the. conventional locomotive, the nozzle is constructed sofasl to furnish jets of Steam upwardly into the smoke-A stack, `creating an accelerated ow Aby expansion ofV the steam whereby the exhaust gases are drawn upwardly `through the stack linintermittent pulses, discharging Saidgas'esatrelatively the re boxfof thelocomotivefA i In accordance .with the present inventiontherf nozzle I5 j comprises. an. upwardly 4convergent elongatedintakeportion I'Ihaving a top iiange I8. "Designatedat I9 is a generallyv cylindrical throat portion having .a bottom flange 20iwhichl is secured to flange I8. The upper'end of-throat portion I9 is open and provides alrelatively large discharge orifice which is only slightly reduced with respect to the inside area of throat member wardly projecting radial arms 22is a downwardly iiaring conical hood 23 overlying the top end of the throat member I9 but being: spaced Vvtherefrom. Asshown in Figures`3 and.4i;ftheltoporii-iV iice 24 of` hood v23 is` substantially larger than orifice 2I and is vertically spaced above the oriiice 2|, and is smaller in diameter than the lower end of the stack I4, as shown in Figures l and 2. The hood 23 denes an annular upwardly convergent passage 25 with respect to the outer surface of throat member I9.

In operation, the exhaust steam iiows upwardly in intake portion I1 and is slightly compressed in throat portion I9. The exhaust Steam escapes upwardly through orice 2| into hood 23 with a moderate throttling action. This throttling action in hood 23 produces a Slight acceleration in the upward movement of the exhaust steam with a reduction in pressure in the upper portion of hood 23 suflcient to draw exhaust gases from the boiler tubes I3 upwardly through the annular convergent passage 25. The exhaust gases are entrained with the upwardly moving steam in the upper portion of hood 23 and the mixture is then discharged through the top orice 24 of the hood, again with a slight throttling action. The mixture of exhaust gas and steam flows upwardly into the smokestack I4, and since the mixture is moving at only a moderate velocity, the smokestack is substantially lled with the upwardly moving mixture of fluids. As a rehigh velocity and creating a pulsingdraft through sult, the discharge from the top of the smokestack is substantially continuous instead of intermittent and a constant vacuum is developed in the smoke box I2, said vacuum producing a constant draft through the locomotive re box without building up back pressure in the smoke box,

The smoke box is provided with a suitable wire mesh spark arrester 26 having a portion 21 thereof extending across the smoke-stack i4 to Vprevent the discharge of sparks from the smoke stack.

While a specific embodiment of an improved exhaust nozzle tip for locomotives has been disclosed in the foregoing description, it will beV unr derstood -that various modicaticns within the spirit of the invention may occur to-those skilled in the art. Therefore, it is intended that no lim-itations be placed on the invention except as de- Vfined by the scope of the appended claims.

What is claimed is:

1. In combination, ay locomotive smoke box including a stack rising from the top of the smoke box and -havingan open lower end in the upper part ofthe smoke box, an exhaust nozzle positioned in the lower part of the smoke box in axial alignment with said stack, said exhaust nozzlecomprising an upwardly tapered tubular intake portionV havingV an open upper end Vand a lower. Vendayzaptegl,to intake exhaust steam from thelocomotive, a uniformly cylindrical open-ended tutubular throat portion mountedaxially .on the upper endof said/intake portion, said throat portion-being of the same diameter as the upper end of said intake portion andY 'anupwardly vconverging` conical hood surrounding said throat portion andmounted thereon, said hood having an open upper -end larger in ,diameter than said throat portion and smaller in diameter than the lower end'of the Vstack end spacedly surrounding said throat portion, the lower end. of said hood being substantially .larger in'diameter than the lower end of the stack, the lower end of the hood being open and positioned on a level below the open upper end of saidthroat portion, the upper end. of said hood being .spaced at a substantial distance below the lower end of said stack.

2. In combination, a locomotive smokebox including a stack rising vfrom the top of thesmokeV box'and havingan open lower end in the upper part of the smoke box, an exhaust nozzle positioned in the lower part of the smoke box in axial alignment with said stack, said exhaust nozzle comprising an upwardly tapered tubular intake portion having an open upper end and a lower end adapted to intake exhaust steam from the locomotive, a uniformly cylindrical open-ended tubular throat portion mounted axially on the upper end of said intake por-tion, said throat portion being of the saine diameter as the upper end of said intake portion, and' an upwardly converging concal hood surrounding said throat portion and mounted thereon, said hood having an open upper end larger in diameter than said throat portion and smaller in diameter than the lower end ofthe stack end spacedly surrounding said Vthroat portion, the lower end of said hood being substantially larger in diameter than the lower end of the stack, the lower end ofthe hood bei'ng open and positioned on a level below the open upper end of said throat portion, the upper end of said hood being spaced at a substantial ldistance below the lower end of said stack, the vupper end of said throat portion being formed with an internal annular lipproviding a slight reduction of the internal diameter of said throat portion at its upper end.

CHARLES W. BAKER.

REFERENCES- `CITED The-following references are of record in the file of this patent.:`

UNITED STATES PATENTS Number Name Date 69,268 Squires Sept. 24, 1867 Y 15J/1,456V Murray Aug, 21, 1877 307,465. Hunter Nov. 4,1884 380,677 Crane Apr. 10, 1888 871,551 Younghusband' Nov.19, 1907 1,297,826 Fuller Mar. 18, 1919 1,380,806 Keller. June 7,192.1; 1,542,257 McMahan June 16, 1925 1,653,537 Barrett Dec. 26,1927

FOREIGN PATENTS Number Country Date 165,453 Switzerland Feb. 1, 1934 

